Improvement



, iint of these (tonnen, und lo ueeomplish the t m i m liti 1 TAT i iii E Ti immowelt-ini i Spi-,n livnlinn liu-:ning purl oi' Letterellntent No. lfil, dnted April 15, ll; application iiled November 9, 1577. s

To all ywhom 'it muy w www.

Re it known that l', .lint-nt A\. ln'i". Jr., o the city of (llhurleoton, Stute oi' South ilurolinu.y lieve 'invented u new und useful Alinproveinent in At'trition-Mille, oi'. nhieh the iollon'ing is i, full, true, ond exnet deserintion, reference heing had to the eeiusnipnngfn drawings,

My invention relative lo that ohms ot mills in vvhieh the grinding.,r or pul'i'lnizing` ot' the uniterinl to be ground in neei'nnplished by the impact and ruhhinp; et' pfu'iielen or poi-tions el eneh :untel-inl ngninnt eheh olher, end is thereby distinguishable l'lolu ihose mills. in which the grinding is done between tivo permanent weiuingnin'i'uees.

it is no douht true ihot in fill `eiilnlinj-inills u'f'lnttsoever n poi-lion of the f viinilingY done hy the pnrticles theinoelves, ne well an; oy the rubbing-surfaces5 butin the preeent invention the grinding;` is exclusively done between the particles oli' iho inoteriul pushing through the niill, in which respeut it .iiit'ers li-oni nlnv ol' the usuel tornio otl grindingI o attrition mill4 new in une.

i :nn ovvero that nniny ornis of uitritionmille have heen mudo, but. so ihr :is l know, in nll these mills the nn'hstnnee to he ground hns heen enueed to inipinoe ugr-einst n surf ee permanently nttuehed to the inne-lune, so that the grinding or uttritii'ln in these niiils is prodneed hy two minnen; iii'nt, the iinpinging` oi' the suhstnmies penning hi'ough the .inillzigninst n eurihoo permanently uttuehed thereto;` neo ond, hy the nnweinent or inipuet. :unione: ihe pui'tieies or noi-linnn oi' iho sulnitnnee whieh in pzieeing; thru h the null. y

'The :ittenipt which i lieve nnlde in thii; apnn'niuo in, no lu :is is posnihle, to avoid the grinding iueively h v 'the iinpeet or friction hetvveen the purl iifien, elf the suhritznn'e imssing through the mill. i ihoi'ehyolilnin zi veryiinpin'tzinii rennh', nninely: il :ivoid the neeeesury weaning unzly ol' the grinding or iinpuet surl'zieen which halve linen previously einp'lloyediu nttriiion-znilio, nud i :snhntitute to; such permanent eiu'l'nces u, eoneiuntly-reneived surl'nee or body' ol the inulerizil-itell', und i use my zippirntus simply un u menne tor giving inotion io ihe eulistuneen to he ground, und not y rm'izniion ol suoli particles, exeept als ,l have inst dest'iihed.

in analogous euse to this invention would he thut. ot' o, millstone having' a eonstnnily-renewed surfziee, which surface Iits itself coinposed oi' the material 'to he ground.

The construction of my apparatus issimple, und eoneiste generally of t series of revolving tubes or` channels fixed in u wheel revolving,` about the eeutrnl exis through which the nim teiizd to be ground. ie constantly'passing and is eonstmitly being;` delivered et the endeI of.' euch tubes against o corresponding,` hody ot the materiel to he ground, which is Simulinneously passing through a series of channels ond'reveliing in the i'ippiisite direction.

Centrifugal i'oiee enuses :t body revolving Aabout zt lined eentei1 to ily olii' at o tangent to its are oi' revolution und to Seel; to retreatis iin' as possible from such revolving` exis; In. my nppnrnitue Il utilize this force tor the pui'- pose ot ioreing the strezun ot' nniteriol to he ground :igninot the griudingeuri'nee. rlhe nuiA teriul so noted upon by this centrifugalforce is, not nllowed to osea-pe freely from the een ter, us is usually the euse, lout is eoniined in guiding-elmundo, where it is retained till 'the end oi' the eolunni which is passing through Louch Channel is pulverizeil by itisv attrition against another similar grilidinglsurlhee, and the material only ndvztneesA in the eoniined ehunnel with the sanne rapidity as it is ground oli' or nlloned to escape from the delivery end of suoli elntnnel.

This retaining of the ninteiinil ivithiuihe mill till it is ground sufi'eiently line to escupe-- which ineness i5 :uitoinutieully deierinined hy the mill, :is will he hereinafter deeerihedconsider one of the most` important Matures: oi' my invention, for in all othei` mills with which 'l ein acquainted :i considerable pinntity of mittel-itil is delivered ateneo to the null, und 'is noted upon-by the apparatus :n3 u whole .till it hue been reduced to n suliioienily iine condition to ineetthe requirements el" the en@m in my inill, on the other hund, no metier how niueh material is fed to it, only n einnll sur i'eoo in noted upon :it ouee, utilizingr the uho'ie force oi' the mill in grinding :t snnill portion closed channeior channets regulating the escape of material, and mechmanana t y for forcing these surfacesto travel past and ing of a determined size, substantially as described.

6. 'The improvement in theprocess of grinding grain and other materials, consisting' in causing two suitably-guided distinct streams of the material to bc ground to impingc against each other, thereby grinding and abradin g the particles composing the two streams, substan tially as described. "r

7. The improvement in the art of grinding, consist-ing in forcing two distinct streams of the materia-l to be ground against each other while given an adverse movement transverse to their dow, substantially as described.

8. In a grinding-mill, two rotating wheels revolving around the same axis, and each having lclosed channels passing through said wheels, which channels have corresponding outlets, substantially as described, whereby two streams of the material to be ground are caused to impinge against each other.

9. The combination, in a grindinglnill, of a forr--eeeiving -and anism for forcing the material by centrifugal force into and through said channels, substantially as described. y

- 10. In a grinding-mill, a revolving wheel, A, having a closed channel, a, passing through the frame ot' said Wheel, and provided with the alterable wearin g-suri'acc r, throughw'vhich the channel c is continued, substantially as described. l

11. In a grinding-mill, the combination oi' two independent wheels revolving inf opposite directions, and provided with closedl channels, havingadjacentcorrespondingopenings,which openings are provided with alterable wearing! surfaces, substantially as described.

12. A grinding-mill provided with two opposed sets of revolving channels, which sets revolve ilidependentlyv around a common axis, and have their corresponding delivery-openings situated at the same distance from the central axis, substantially as described.

13. A grinding-mill provided with two wheeis revolving in opposite directions, which wheeis are provided with the closed channels a and c', and the central cavities o, substantiel-ity described.

14. The combination of a revolving wheel, having a closed channel or channels for thc passage of a stream of grain or other materi i, and a grinding or attrition surface. in immediate proximity to the delivcryport of said channel, whereby the material to be reduced is retainedin said revolving channel untii itis sni lieiently reduced tc escape through an open ing of a determined size, and is then alloived to escape innnediatelyintc the delivery, there by avoiding unnecessary abrasion andunnec essa-ry expenditure of power, substantially as described.

15. The process ci' reduciu g substances here inbeiore described, which consists indeliverf ing the material to the milLwithin a closed channel, which material is subsequently passed through two revolving channels, and is by them compacted into two grinding-surfaces, which are forced together by the pressure ot" the gradually-advancing material, and are caused to pass over each other.

16. In a grlnlingmill, the two wheels A and A', provided with channels a and a', and mounted upon two adjust-able sliding frames, F and F', whereby the distance between said revelving wheels may be varied, snos'tantialiy as described.

17. In a grilnling-mill, the combination of two wheels, A and A', revolving iin opposite directions, supported on the adjustable frames F and F, and provided with the alterable wearing-suriaces r and r', snbstantiaiiy as de scribed.

1S. In a grinding-mill, two wheels A and A', revolving in opposite directions, which wheels consist ci' a central revolv' ig wheel or disk, 71 provided with partitions or webs Y, which connect it with the exterior surface, vf', between which webs the material is passed to be ground at the deliveryiaperiares a of the channels, substantially as described.

HENRY A. DUC,

Witnesses:

S. F. SULLIVAN,

N. DioKnasoN, Jr. 

